In chapter 8 of Animal Farm, what the theme and what is the mood?

The theme is that of replacing a corrupt system with an
equally oppressive system. The mood is one of forced optimism as the animals are
determined to finish the second windmill. When they engage in the war with Frederick
(after he has robbed them), he blows up the windmill. So, the mood is also one of
despair and uncertainty since Napoleon (via Squealer) still continues to change the laws
to suit his wishes. The latest is that ‘no animal shall drink alcohol to excess.’
Napoleon continues to spread lies about Snowball (that he was not a great hero in the
battle of the cowshed) and continues his attempts to ally the animals by pitting them
against others (Snowball and Frederick). For Napoleon and his retinue, the mood is
surely optimistic, despite the setbacks because he and his court have all the power and
privilege. For the rest of the animals, the mood is more despondent than it ever was
under Jones.